Design of 140GHz Narrow Band-pass Planar Filters Based on Open Loop Resonators

In this paper, a universal design procedure for narrow-band filter based on square open-loop resonators is established. The square open-loop resonator is partitioned into microstrips and coupled microstrips which are characterized separately. The coupled microstrips are represented as a four-port device and a BP neural network is established to map the entire S-parameter while the gap and folded microstrips are modeled simply by lumped parasitic-included equivalent circuits. The entire design procedure is demonstrated by implementing a planar D-band narrow band band-pass filter. The measurement results show that the filter exhibits insertion loss around 4.3dB at 140GHz and FBW about 6% which are close to most waveguide filters. To the best of the authors’ knowledge, this is the narrowest bandwidth in D-band filter with relatively low insertion loss among planar solutions.

[1]  R. Marks.  A multiline method of network analyzer calibration , 1991 .

[2]  R. Storn,et al.  Differential Evolution: A Practical Approach to Global Optimization (Natural Computing Series) , 2005 .

[3]  Herbert Zirath,et al.  A $D$-Band 48-Gbit/s 64-QAM/QPSK Direct-Conversion I/Q Transceiver Chipset , 2016, IEEE Transactions on Microwave Theory and Techniques.

[4]  P. Young,et al.  Millimeter-wave substrate integrated waveguides and filters in photoimageable thick-film technology , 2005, IEEE Transactions on Microwave Theory and Techniques.

[5]  Mudrik Alaydrus,et al.  A bandpass filter based on square open loop resonators at 2.45 GHz , 2013, 2013 3rd International Conference on Instrumentation, Communications, Information Technology and Biomedical Engineering (ICICI-BME).

[6]  F. Gianesello,et al.  1.8 dB insertion loss 200 GHz CPW band pass filter integrated in HR SOI CMOS Technology , 2007, 2007 IEEE/MTT-S International Microwave Symposium.

[8]  E. Rius,et al.  Band-pass coplanar filters in the G-frequency band , 2005, IEEE Microwave and Wireless Components Letters.

[9]  Joachim Oberhammer,et al.  An Ultra Low-Loss Silicon-Micromachined Waveguide Filter for D-Band Telecommunication Applications , 2018, 2018 IEEE/MTT-S International Microwave Symposium - IMS.

[10]  E. Rius,et al.  Design of narrow band-pass planar filters for millimeter-wave applications up to 220 GHz , 2005, IEEE MTT-S International Microwave Symposium Digest, 2005..